Can you do it using this formula

Interpolating polynomials can be generated recursively! Po,1 = [(x - Xo) P1 + (x - X1 ) Pol X1 - XO 1 P1.2 = [(x - X1 ) P2 + (x - X2) P1] X2 - X1 Po, 1,2 = [(x - X0) P1,2 + (x - X2) Po, 1] X2 - XO